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    copied!<p>Grid width should be calculated as </p> <pre><code>grid1.Width = (scrollViewer1.ViewportWidth / 3) * grid1.ColumnDefinitions.Count; grid1.Height = (scrollViewer1.ViewportHeight / 2) * grid1.RowDefinitions.Count; </code></pre> <p>This seemed to work for me:</p> <p>XAML:</p> <pre><code>&lt;DockPanel&gt; &lt;ListBox Width="150" DockPanel.Dock="Left" BorderBrush="AliceBlue" BorderThickness="2"&gt; &lt;Button Name="AddColumn_Button" Width="100" Height="25" Content="Add Column" Click="AddColumn_Button_Click" Margin="5"/&gt; &lt;Button Name="AddRow_Button" Width="100" Height="25" Content="Add Row" Margin="5" Click="AddRow_Button_Click" /&gt; &lt;/ListBox&gt; &lt;ScrollViewer Name="scrollViewer1" BorderBrush="AliceBlue" BorderThickness="2" SizeChanged="scrollViewer1_SizeChanged" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" Margin="1"&gt; &lt;Grid Name="grid1" ShowGridLines="True" &gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition /&gt; &lt;RowDefinition /&gt; &lt;/Grid.RowDefinitions&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition /&gt; &lt;ColumnDefinition /&gt; &lt;ColumnDefinition /&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;/Grid&gt; &lt;/ScrollViewer&gt; &lt;/DockPanel&gt; </code></pre> <p>CODE BEHIND:</p> <pre><code> private void scrollViewer1_SizeChanged(object sender, SizeChangedEventArgs e) { SizeGrid(); } private void AddColumn_Button_Click(object sender, RoutedEventArgs e) { ColumnDefinition gridColN = new ColumnDefinition(); grid1.ColumnDefinitions.Add(gridColN); SizeGrid(); } private void AddRow_Button_Click(object sender, RoutedEventArgs e) { RowDefinition row = new RowDefinition(); grid1.RowDefinitions.Add(row); SizeGrid(); } private void SizeGrid() { grid1.Width = (scrollViewer1.ViewportWidth / 3) * grid1.ColumnDefinitions.Count; grid1.Height = (scrollViewer1.ViewportHeight / 2) * grid1.RowDefinitions.Count; } </code></pre>
 

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